diff --git a/example-sysctl/Makefile b/example-sysctl/Makefile
index dfd0d65d..67dce95e 100644
--- a/example-sysctl/Makefile
+++ b/example-sysctl/Makefile
@@ -1,9 +1,10 @@
 obj-m := examplesysctl.o
 examplesysctl-objs := target/x86_64-linux-kernel-module/debug/libexample_sysctl.a
 EXTRA_LDFLAGS += --entry=init_module
+KDIR ?= /lib/modules/$(shell uname -r)/build
 
 all:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR)
+	$(MAKE) -C $(KDIR) M=$(CURDIR)
 
 clean:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR) clean
+	$(MAKE) -C $(KDIR) M=$(CURDIR) clean
diff --git a/hello-world/Makefile b/hello-world/Makefile
index ff54b9e9..fccc18c3 100644
--- a/hello-world/Makefile
+++ b/hello-world/Makefile
@@ -1,9 +1,10 @@
 obj-m := helloworld.o
 helloworld-objs := target/x86_64-linux-kernel-module/debug/libhello_world.a
 EXTRA_LDFLAGS += --entry=init_module
+KDIR ?= /lib/modules/$(shell uname -r)/build
 
 all:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR)
+	$(MAKE) -C $(KDIR) M=$(CURDIR)
 
 clean:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR) clean
+	$(MAKE) -C $(KDIR) M=$(CURDIR) clean
diff --git a/static-filesystem/Makefile b/static-filesystem/Makefile
index 67052baa..7b5f28c1 100644
--- a/static-filesystem/Makefile
+++ b/static-filesystem/Makefile
@@ -1,9 +1,10 @@
 obj-m := staticfilesystem.o
 staticfilesystem-objs := target/x86_64-linux-kernel-module/debug/libstatic_filesystem.a
 EXTRA_LDFLAGS += --entry=init_module
+KDIR ?= /lib/modules/$(shell uname -r)/build
 
 all:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR)
+	$(MAKE) -C $(KDIR) M=$(CURDIR)
 
 clean:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR) clean
+	$(MAKE) -C $(KDIR) M=$(CURDIR) clean
diff --git a/tests/Makefile b/tests/Makefile
index 5184e4d7..acfd9592 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,9 +1,10 @@
 obj-m := testmodule.o
 testmodule-objs := $(TEST_LIBRARY)
 EXTRA_LDFLAGS += --entry=init_module
+KDIR ?= /lib/modules/$(shell uname -r)/build
 
 all:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR)
+	$(MAKE) -C $(KDIR) M=$(CURDIR)
 
 clean:
-	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR) clean
+	$(MAKE) -C $(KDIR) M=$(CURDIR) clean